Sewing machine



Nov. 23, 1937. R. w. JOHNSON ET AL SEWING MACHINE Filed March 1, 1937 INVENTORJ .Jo

1:41.902, Lox/ml,

' Richard Cltatlts Max ,Zamn/ ATTORNEY.

armed Nov. 23, m7 I 2,100,166

STATS TENT OFFICE 2,100,168 f SEWING MACHINE Richard William Johnson, Charles Lester Lovetch, and Max Zaum, Brooklyn, N. -Y., assignors to Fine Art Novelty Corporation, New York, N. Y., a corporation of New York Application March 1, 1937, Serial No. 128,360

4 Claims. (Cl. 112-49) This invention relates to improvements in seweye pointed needle 8 accommodating a suitable ing machines. One of the objects of the inventhick yarn 9; I tion is to provide a. sewing machine capable of The feeding mechanism comprises a feed-dog producing a series of discontinuous U-shaped l operating through suitable slots in a throatloops of yarn, the ends of which are free from plate mounted on cloth-plate l I. Feed-dog ID adjacent loops. A further object is to provide is carried by the feed-bar l2, which is, in turn, an attachment for the underside of the cloth actuated in any suitable well known manner to plate of a sewing machine, wherein the loopprovide a single feeding movment of the feedtaker forms part of a shearing mechanism whichdog during a part of the cycle of operation of.

' shears once for each complete reciprocation of the vertical reciprocating needle 8. As feeding m th ne dl mechanisms of this character are well known in A more detailed description follows in conthe art, it is deemedunnecessarytohereindescribe junction with the drawing, wherein like reference such a mechanism for a complete understanding numerals designate like parts. of the P n invention. a

Fig. 1 illustrates a front end elevation, partly The shearing mechanism of the v o in section, showing only that portion of a. sewing which is shown in more detail in Fig. 2, is mountmachinc equipped with the'present improvement d n n h the bed Plate and p is s which is necessary for an understanding of the par a pker l3 and a forkinvention; shaped knife I4.

F1 ,,2 i full siz i the tial l The loop-taker consists of a massive shoulder ments of the shearing attachment of the inven- 20 ving integral h r w h a Sm round finger or beak I 9 provided with a shearing edge Fig 3 1 side i of Fig, 2, along th line 22 along a portion of the inner surface, as shown. 3-$, with the bed or supporting portion of the. At its center, loop-taker I 3 very loosely accom- 25 sewing ma hi e in s ti modates the looper actuating shaft l5 but is Fig. 4 is a cross-sectional view of Fig.2 along fi y l k d to h t l5 at another point by the line 6-4; means of off-center screw it which is set into 8. Figs. 5a, 5b, and 5c are perspective detail views 8 Of a metallic bushing in rn 1 showing progressive positions of t shearing rounding the shaft for a portion of its length mechanism of the invention in the process f and secured thereto by means of screw l8. Mov- 3 making and shearing loop of yarn, The g ably linked to loop-taker I 3 by the same screw and dash lines of Fig. 50 show the actual shear- 1S fork-Shaped knife Wh kn ed e 2! mg position; is designed to cooperate with the shearing edge Fig. 6 is a cross-sectional view of Fig. 50 along a of finger Knife is maintained in D line g 3 and shows t position of the shearing sition between the loop-taker l3 and a spring knife a d looper immediately befor the yarn is washer 23, the latter of which separates the arch and v of the knife from the screw iii in such manner p 7 t 7; Show diagrammatically, d in that as the loop-taker rotates, the knife is caused section, the progressive positions of the needle to move relative to the loop-taker and to assume 40 m the cutting f the yam. The positions of the various positions. A roller 24 located between loop-taker and knife are omitted from Figs. 7a, the tines 9f the fork'shaped knife, and held 7b, and 7 in order to i plify an understanding in place by screw 25 to the bed 26 of the sewing of the complete cycle of operati machine, serves to guide the movement of the R ferring to Fig 1 in more detail, the sewing knife as it is lowered and raised by rotation of machine in which the invention has been emthe loop'taker' bodied is shown as comprising ahollow standard Figs 3 and 4 Show side and cross'secflonal which curves and terminates m a head 2. views of Fig. 2, respectively,.,a.long the lines 33 and 4-4, and illustrate more clearly the man- Mounted for vertical movement in the head 2 her in which the loomtaker l3 forbshaped by the manual manipulation of the lifting lever 3 is the usual presser-bar 4 carrying one ormore g gi g: and the t i shaft are linked presser feet 5. The hand or band wheel is rep- From what has gone before it will be evident resented by the reference numeral 8. Secured that when the fi g r H of the 1oop taker is on in the usual manner to a vertically reciprocating t upward t t shoulder 20 of t ]op-. needle bar by, means of a needle clamp I is the taker will .be on its downward travel and will cause knife I also to move' downward, guided by roller 24. rections of travel at a particular position of the The arrows in Fig. 2 indicate the dielements I! and i4. Movement of the looptaker in the opposite direction will, of course, produce a similarly opposite movement of the knife I. It will also be evident that at another point in the travel of the loop-taker l 3," shown in Fig. 1 and by the dotted lines of Fig. 5c, the

knife edge 2i of knife I and the shearing edge 22 of loop-taker it will come together and cause shearing of any. yarn which may happen to be between the two shearing surfaces at that moment. Fig. 6 illustrates a cross-sectional view of first descends to form a loop of yarn which is "the shearing surfaces 2| and 22 immediately prior.

to the cutting of the yarn 9.

Figs. 5a, 5b, and 5c show progressive positions of the loop-taker i3 and knife I asthe needle seized by'the finger i9 and then rises to enable the shearing to take place and the feeding of the work occurs only once in every complete reciprocation or cycle of the needle. An inspection of work to occur. In the operation of'the invention, as.. indicated diagrammatically in Figs.- 7a. to if. the needle 8 is caused by its well known actuating mechanism to penetrate the material or work 26 immediately following the first forward feeding movement of the feed-dog l0, descending below the work to. throw out a loop of yam in proper position for seizure by the loop-taker finger or beak IQ. Fig. 70 indicates the downward travel of the needle. Fig. 7b shows the needle at its lowest position, and Fig. 7c indicates the start of the upward travel of the needle. In these three figures the positions. of the loop-taker it and the knife it have been omitted in order to avoid complicating the drawing, because the finger' I! has not, up to this time, in the travel of the needle seized the loop of yarn. Fig. 7d shows that the smooth round portion of finger i9 enters the loop after the needle has started to rise. In

. other words, the needle after descending haabeen slightly raised and a loop of yarn is thusformedl which is immediately entered by the finger i9. In Fig. 7e the needle has risen above the work and the shearing surfaces are about to engage. Fig. 7/ shows the position of the shearing sur- 'faces'immediately after the yarn has been cut.

Subsequent to this the surfaces 2i and 22 progressively separate, a lateral feeding movement of the work takes place, meme cycle of opera tions of Figs. 7a to if is repeated. v

Itis important to note in the cycle of opera- -tions indicated in Figs. 'lato If, for producing a U'-shaped loop of yarn, that the feeding of the Figs. 7a to 71' shows, of course. that the needle descends below and rises above the work in the same hole pierced by it.

' Inone embodiment of the invention,'the presa,roo,reo v ent improvement has been applied toa well known type of sewing machine wherein the looper actuating shaft II oscillated first in one direction and then in the other, .the shearing occurring only during one direction of travel of the shaft and the feeding during the other direction of travel of the shaft. What is claimed is:

1. In a sewing machine, the combination with a reciprocating needle and a loop-taker actuating shaft, of yarn shearing mechanism rotatable by said shaft, said mechanism comprising, a loop-taker having a shearing surface and a forkshaped knife eccentrically mounted on and mov able with said loop-taker, relatively stationary means between the tines of said forked-knife for guiding the movement of said knife, said knife and saidshearing surface of said loop-taker cooperating to cut yarn carried by said needle at L a predetermined position of said loop-taker.

surface on a portion removed from its free end,

' a fork-shaped knife mounted on the wider portion of said loop-taker and movable with said loop-taker, said knife having a shearing edge and a pair ofseparated tines, a relatively stationary'roller located between said tines for guiding movementof said knife. the shearing edge of said knife and the shearing surface of said finger being adapted to cooperate at a predetermined location in the path of travel of said looptaker to form yarn shearing mechanism.

3. In a sewing machine, the combination with .a reciprocating needle and a loop-taker actuat 'ing shaft; of yarn shearing mechanism rotatable by said shaft, said mechanism comprising a looptaker having a shearing surface and a forkshaped knife mounted on and movable with said loop-taker, a roller positioned between-the tines of said fork-shaped knife for guiding'the move'-.

ment thereof, the arch-of said knife and said shearing surface of said loop-taker cooperating to cut yarn carried by said needle at a predetermined position of said loop-taker.

4. A sewing. machine as defined in claim 3, characterized in this that said shaft oscillates in two directions of travel.

RICHARD WILLIAM Jormsou. cnsnms LESTER. LOVERCH. mix ZAUM. 

